/*
 * Copyright 2007 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*namespace com.google.zxing.qrcode.decoder {*/

import Exception from './../../Exception'

export const enum ErrorCorrectionLevelValues {
  L,
  M,
  Q,
  H
}

/**
 * <p>See ISO 18004:2006, 6.5.1. This enum encapsulates the four error correction levels
 * defined by the QR code standard.</p>
 *
 * @author Sean Owen
 */
export default class ErrorCorrectionLevel {

  private static FOR_BITS = new Map<number, ErrorCorrectionLevel>()
  private static FOR_VALUE = new Map<ErrorCorrectionLevelValues, ErrorCorrectionLevel>()

  /** L = ~7% correction */
  public static L = new ErrorCorrectionLevel(ErrorCorrectionLevelValues.L, "L", 0x01)
  /** M = ~15% correction */
  public static M = new ErrorCorrectionLevel(ErrorCorrectionLevelValues.M, "M", 0x00)
  /** Q = ~25% correction */
  public static Q = new ErrorCorrectionLevel(ErrorCorrectionLevelValues.Q, "Q", 0x03)
  /** H = ~30% correction */
  public static H = new ErrorCorrectionLevel(ErrorCorrectionLevelValues.H, "H", 0x02)

  private constructor(private value: ErrorCorrectionLevelValues, private stringValue: string, private bits: number /*int*/) {
      ErrorCorrectionLevel.FOR_BITS.set(bits, this)
      ErrorCorrectionLevel.FOR_VALUE.set(value, this)
  }

  public getValue(): ErrorCorrectionLevelValues/*int*/ {
    return this.value
  }

  public getBits(): number /*int*/ {
    return this.bits
  }

  public static fromString(s: string): ErrorCorrectionLevel {
    switch(s) {
      case "L": return ErrorCorrectionLevel.L
      case "M": return ErrorCorrectionLevel.M
      case "Q": return ErrorCorrectionLevel.Q
      case "H": return ErrorCorrectionLevel.H
      default: throw new Exception(Exception.ArgumentException, s + "not available")
    }
  }

  public toString(): string {
    return this.stringValue
  }

  public equals(o: any): boolean {
    if (!(o instanceof ErrorCorrectionLevel)) {
      return false
    }
    const other = <ErrorCorrectionLevel> o
    return this.value === other.value
  }
  /**
   * @param bits int containing the two bits encoding a QR Code's error correction level
   * @return ErrorCorrectionLevel representing the encoded error correction level
   */
  public static forBits(bits: number /*int*/): ErrorCorrectionLevel {
    if (bits < 0 || bits >= ErrorCorrectionLevel.FOR_BITS.size) {
      throw new Exception(Exception.IllegalArgumentException)
    }
    return ErrorCorrectionLevel.FOR_BITS.get(bits)
  }

}